formats/ctf/types/sequence.c

   1 /*
   2  * Common Trace Format
   3  *
   4  * Sequence format access functions.
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <babeltrace/ctf/types.h>
  22
  23 int ctf_sequence_read(struct stream_pos *ppos, struct definition *definition)
  24 {
  25         struct definition_sequence *sequence_definition =
  26                 container_of(definition, struct definition_sequence, p);
  27         struct declaration_sequence *sequence_declaration =
  28                 sequence_definition->declaration;
  29         struct declaration *elem = sequence_declaration->elem;
  30         struct ctf_stream_pos *pos = ctf_pos(ppos);
  31
  32         if (elem->id == CTF_TYPE_INTEGER) {
  33                 struct declaration_integer *integer_declaration =
  34                         container_of(elem, struct declaration_integer, p);
  35
  36                 if (integer_declaration->encoding == CTF_STRING_UTF8
  37                       || integer_declaration->encoding == CTF_STRING_ASCII) {
  38
  39                         if (integer_declaration->len == CHAR_BIT
  40                             && integer_declaration->p.alignment == CHAR_BIT) {
  41                                 uint64_t len = sequence_len(sequence_definition);
  42
  43                                 ctf_align_pos(pos, integer_declaration->p.alignment);
  44                                 if (!ctf_pos_access_ok(pos, len * CHAR_BIT))
  45                                         return -EFAULT;
  46
  47                                 g_string_assign(sequence_definition->string, "");
  48                                 g_string_insert_len(sequence_definition->string,
  49                                         0, (char *) ctf_get_pos_addr(pos), len);
  50                                 ctf_move_pos(pos, len * CHAR_BIT);
  51                                 return 0;
  52                         }
  53                 }
  54         }
  55         return sequence_rw(ppos, definition);
  56 }
  57
  58 int ctf_sequence_write(struct stream_pos *ppos, struct definition *definition)
  59 {
  60         struct definition_sequence *sequence_definition =
  61                 container_of(definition, struct definition_sequence, p);
  62         struct declaration_sequence *sequence_declaration =
  63                 sequence_definition->declaration;
  64         struct declaration *elem = sequence_declaration->elem;
  65         struct ctf_stream_pos *pos = ctf_pos(ppos);
  66
  67         if (elem->id == CTF_TYPE_INTEGER) {
  68                 struct declaration_integer *integer_declaration =
  69                         container_of(elem, struct declaration_integer, p);
  70
  71                 if (integer_declaration->encoding == CTF_STRING_UTF8
  72                       || integer_declaration->encoding == CTF_STRING_ASCII) {
  73
  74                         if (integer_declaration->len == CHAR_BIT
  75                             && integer_declaration->p.alignment == CHAR_BIT) {
  76                                 uint64_t len = sequence_len(sequence_definition);
  77
  78                                 ctf_align_pos(pos, integer_declaration->p.alignment);
  79                                 if (!ctf_pos_access_ok(pos, len * CHAR_BIT))
  80                                         return -EFAULT;
  81
  82                                 memcpy((char *) ctf_get_pos_addr(pos),
  83                                         sequence_definition->string->str, len);
  84                                 ctf_move_pos(pos, len * CHAR_BIT);
  85                                 return 0;
  86                         }
  87                 }
  88         }
  89         return sequence_rw(ppos, definition);
  90 }